Electric heating tube refers to a tubular electric heating element, mainly composed of iron-chromium-aluminum alloy, nickel-chromium alloy heating wire, stainless steel or copper tube metal tube shell, filled with magnesium oxide powder with good insulation and thermal conductivity, and nozzle It is composed of sealing agent such as silicone rubber for sealing at both ends.

Electric heating tubes are classified by medium

Electric heating tube for heating water, weak acid and weak alkali liquid

Electric heating tube for thawing food oil

Electric heating tube for strong acid and alkali heating

Electric heating tube for heating in still air

Electric heating tube for heating in air at a certain flow rate

Aluminum alloy, copper and other components are cast and embedded in them with electric heating tubes

Calculation of the calorific value of electric heating tube

A voltage regulator can be used to change the heat output by changing the input voltage and current.

The calorific value is proportional to the square of the voltage and proportional to the square of the current.

When the voltage becomes 1/2, the heat generation becomes 1/4

When the current becomes 1/2 of the original, the heat generation also becomes 1/4

Visual inspection of electric heating tube

The most intuitive way to verify the quality of the heating tube is: first wipe the surface of the heating tube, then switch on the AC 220V power supply, dry it in the air, turn off the power after the surface becomes red, and wipe it with a napkin after the heating tube is completely cooled. There should be no black oxidized powder (not reacting with oxygen in the air), indicating that it is a high-quality electric heating tube. The basic requirements are: The surface of the electric heating tube is clean, without obvious scars, no bending, deformation, etc.